Rust or corrosion preventing material or lubricant



Patented Nov. 15, 1938 UNITED SIT-ATE nus'r omcoaaosioN ranvnu'rmcMari-mm on. LUBRICANT Eric Rofe Styles, Minoco Wharf, West Silvertown,London, England, assignor to Sllvertown Lnbricants Limited, London,England No Drawing. Application February 23, 1937, Serial-No. 127,316.In Great Britain February 4,

This invention relates to solid, semi-liquid or liquid materialshavinglubricating and/or rust or corrosion-resisting. or preventingproperties.

' it Claims. (01. s'i-s) Other substanceswhich are free from petroleumhydrocarbons may be added to the material for r the purpose of modifyingits properties; for ex- The object'of the present invention is toprovide 1 a stable lubricant and/or material adapted to affordprotection against rust or corrosion, which is substantially innocuousor relatively harmless to rubber, rubber-like masses or rubber C0111:

pounds, with-the advantage that the lubricant or material may be freelyused in situations where it is difficult or impossible to avoid itscoming into contact with rubber or the like or with materialsincorporating it, vulcanized or otherwise. 'It is a further object oftheinvention to provide a substantially anhydrous lubricant having theabove mentioned qualities. 1 The invention is based upon the observatiothat no appreciable deleterious action on rubber and rubber-like massesresults from treatment with "castor oil in the absence of petroleumhydrocarbons and free fatty acids and that castor .oil assumes desirablephysicalcharacteristics when incorporated with an oil soluble metalsoap.

According to the invention, a material suitable for use as a lubricantor corrosion-resisting coating material comprises castor oil and a metalsoap (other than an alkali metal'soap) and is substantially free fromfree fatty acids and petroleum hydrocarbons.

Also in accordance with the invention, amaterial suitable for use as alubricant or corrosionresisting coating material is prepared by? in- 10%and, preferably, not morethan'about 2 /2% 10 1 stances should beavoided.

ample neutral wool grease may be included to increase the anti-corrosiveproperties. As, however, it appears that such additional substances arenot without some deleterious effect on'rubber,

even in the case of neutral wool grease, it is de- I sirable to limitthe addition to not more than of the lubricant; while if it is'desiredto obtain the maximum inertness towards rubber in the composition of theinvention such additional sub- In carrying the invention into effectaccording 15 to one convenient method for producing a soft lubricanthaving a melting point in the range 75 to 100 C., castor oil is heatedtogether with from 8 to 10% of lead stearate, the temperature employedbeing sufficient only to melt the lead 0 soap completely, e. g. 125'C.,-since the use of higher temperatures mayresult in discoloration ofthe product. Any'acidity in the mixture is neutralized by addition ofthe amount of leadcarbonate.

A lubricant of medium hardness may be prepared by proceeding in themanner described above 'andincreasing the lead stearate content to 15%of the castor oil. A hard lubricant is obtained when an amount of lead,stearate of from 3Q corporating castor oil with a metal soap (other.

A treatment of the castor oil with any suitable basic substance inquantity at least equivalent to the free fatty acid content; a preferredbasic sub-'- stance being the carbonate of the metal 01' the soap employespeciallyif the quantity of free fatty acid is relatively large.

In carrying out the. invention, it is' preferred to employ-the heavymetal soaps and in particular the lead soaps. The lead soaps produce anunctuous, sticky, free-flowinggrease with excellent properties as anextreme pressure lubricant.

The amount of the. metal soap'employed is desirably adjusted accordingto the, d'esiredviscosity or consistency of the material, a con"-'venient range of concentration being fromabout 8% to about 30% of thecastor oil.

- 25 to 30% is employed. v

A's lead stearate hasa higher melting point than most common lead soaps,the substitution of other lead soap for the leadstearate in theexappropriate amples given above will usually result in a lubricant oflower melting point. Having now described claim as new and desire toPatent is:

1. A material having 7 resisting qualities and suitable for use incontact withrubber, consisting of castor oil anda metal soap, other thanan alkali metal soap, and a basic substance capable'of neutralizing thefree fatty acids present in the oil.

secure by Letters metal soap in amount from 8% to 30% of the myinvention, what I lubricating and corrosion- 40 2. A material havinglubricating and corrosionamount of castor oil, and a basic substancecapable of neutralizing the free fatty acids in the oil. 3. A materialas claimed in claim 1 wherein the metal soap, is a lead soap.

4. A material is claimed in claim 1 wherein the I metal soap is leadstearate.

resisting properties and suitable for use in contact with rubber, formedessentially from castor oil, a heavy metal soap, and the carbonate ofthe heavy metal of the soap in amount at least equivalent to free acidpresent in the oil.

9. A material having lubricating and corrosion resisting properties andsuitable for use in contact with rubber, formed essentially of castoroil, a lead soap'and lead carbonate in amount at least equivalentto,free fatty acid present in the oil.

' 10. A material as claimed in claim 9 wherein 10 the lead soap is leadstearate.

ERIC ROFE STYLES,

